Math (Sum, Average, Differential) Modules

lifetime warranty
  • Lifetime Warranty on API Modules
  • LoopTracker® I/O LEDs
  • Hot-Swappable Plug-In Design
  • Zero and Span Output Calibration
  • Push to Test Output
  • Full I/O/Power Isolation
Click on PDF links below
for product information

Literature and Links

API product brochure

See all DC input transmitters

Options & accessories

Cross reference

Reference Info

LoopTracker and Output Test
Sink vs Source


Phase separator water level control
Air Flow measurement
Milling machine feed

How to Order

  1. Select a model
  2. See data sheet for ordering info and power options
  3. Request an API price list via chat
  4. 2-5 day typical lead time (USA customers)
  5. To place your order
Model Input/Output Features Product

DC to DC Signal Conditioners
Math Functions

Factory Configured

API 4400 G - API 4408 G

Open Datasheet
Download Datasheet

API 4400 G: (A+B+C+D)/4
API 4401 G: (A+B+C)/3
API 4402 G: (A+B)/2
API 4403 G: (A+B+C–D)/3
API 4404 G: (A+B–C–D)/2>
API 4405 G:  A–B–C–D
API 4406 G: (A+B–C)/2
API 4407 G:  A–B–C
API 4408 G:  A–B

Specify input ranges
Factory configured
Input negative is common
0-100 mV to 0-10 V
±100 mV to ±10 V
0-1 mA to 0-20 mA, 4-20 mA

Specify output range
Factory configured
0-1 V to ±10 V
0-2 mA to 0-20 mA, 4-20 mA
  • Hot-swappable plug-in design
  • Direct replacements for Action AP 4400 series
  • I/O LoopTracker LEDs
  • Output test button
  • Full I/O/power isolation
  • Uses API-011 11-pin socket
  • 115 VAC powered
  • A230 option for 230 VAC
  • P option for 85-265 VAC, 60-300 VDC power
  • D option for 9-30 VDC power

Api 4400G
API 4400 G to API 4408 G

4 Digit 4-20 mA Loop Powered Display

Field Rangeable


Open Datasheet
Download Datasheet

Open Installation Manual
Download Installation Manual
Loop Powered Display
Input: 4-20 mA
Display: 4 digit red LED

  • 1/8 DIN panel mount or IP66 housing
  • Scaleable 4 digit display

CE logo  new!